<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width">
    <title>Title</title>
</head>
<style>
    *{
        padding: 0;
        margin: 0;
    }
    .box{
        width: 200px;
        margin: 0 auto;
        position: relative;
    }
    .box button{
        width: 160px;
        height: 30px;
        border: 0px;
        background: #06AE56;
        color: #FFFFFF;
        font-weight: bolder;
        border-radius: 5px;
        outline: none;
    }
    input{
        width: 160px;
        height: 30px;
        border: 0px;
        background: #07C160;
        color: #FFFFFF;
        font-weight: bolder;
        border-radius: 5px;
        outline: none;
        margin-top: 5px;
    }
    .banner{
        width: 200px;
        margin: 0 auto;
    }
    img{
        position: absolute;
        left: 20px;
        top: 5px;
        animation: round 1s linear infinite;
    }
    @keyframes round {
        0%{transform: rotate(0deg);}
        100%{transform: rotate(360deg);}
    }
    a:link{
        text-decoration: none;
        font-size: 10px;
        color: #85bae4;
    }
</style>
<body>
<div class="box">

    <button>页面主操作</button>
    <img width="20" src="loading.svg" alt="">
</div>
<div class="banner">
    <input type="button" value="页面主操作"> <br>
    <a href="index.html">作业一</a>
    <a href="demo.html">作业二</a>
</div>
</body>
</html>